Some observations re lithium and small Genny?

[Bessy765]

Sorry if this is a long post but not the best at explaining. Having recently had a lithium upgrade, as previousl posted we have 700 watts of solar a Victron 2000/80 multi and 2 x 100 amp transporter Lithium batteries.
as we are still waiting for good old DVLA i thought I would have a little play and found the following
the Genny is a Honda EU10i running on lpg.
using the inverter only running the Dometic Fresh jet 2200 set to max cooling draws 103.3 amps with the Genny set at 4 amps @ 240 the battery consumption falls to 55 amps. Setting the Fresh jet to max heating uses 83 amps dropping to 33 amps with Genny set at 4 amps
Truma heating set at 1kw draws 83.1 amps again dropping by app 50 amps when Genny flat out, 2 kw draws 195 amps again dropping by app 50 amps with Genny set at 4 amps.
Dometic fridge on mains supplied by inverter only takes 15.4 amps,

Genny only charging the batteries through the multi, set mains input at 2 amps Genny stays on its idle setting producing 30.3 amps to the batteries, up the incoming from the Genny to 2.5 amps produces 36 amps Genny just a fraction above idle, up to 3 amps Genny increases but not flat out produces 43.3 amps, upto 3.5 amp from Genny produces 48.7 amps, Genny flat out 57 amps charging.

this again is not about the pros and cons of using a Genny but simply to give anyone who is interested some idea of what uses what and what produces what

 

[bigtwin]

I’m not sure what point you’re making here.

With the generator running (and supplying your Victron charger), the batteries, through the inverter, have only to make up the charger shortfall. The more you limit the current from your ‘shore’ supply the more work your battery has to do.

Am I missing something?

Ian

 

[Bessy765]

Yes it was to observe what a Genny can do. And what current draw can be when using an inverter. It may give some indication of what amount of battery capacity you may require if you are planning to use an inverter. Especially when you read of someone planning to run an inverter from the cigarette lighter socket etc.

 

[pappajohn]

103.3amps from a 1kw Honda generator.....???
Do you mean the Aircon was drawing 103amps from the batteries via an inverter and the generator was pushing 4 amps back into the batteries.

 

[Bessy765]

The Honda Genny running flat out was putting 4 amps at 240 ac, which reduced the load from the batteries to the inverter by 57 amps. It was really loaded not that I would attempt to run it at that rate just seeing what would happen.

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[jongood]

103.3amps from a 1kw Honda generator.....???
Do you mean the Aircon was drawing 103amps from the batteries via an inverter and the generator was pushing 4 amps back into the batteries.

Inverter 103 amps at 12v with genny giving 4 amps at 230v ?

 

[bigtwin]

Inverter 103 amps at 12v with genny giving 4 amps at 230v ?

I think that he was setting a current limit on the ‘shore’ supply and observing how many amps the inverter then pulled from the batteries. The lower the current limit permitted from the ‘shore’ supply, the greatthe shortfall to be made up via the inverter.

Ian

 

[funflair]

Inverter 103 amps at 12v with genny giving 4 amps at 230v ?

This is the problem with amps watts are a lot more reliable really.

 

[bigtwin]

This is the problem with amps watts are a lot more reliable really.

Watt he said

Ian

 

[cyberyacht]

Unless I'm mis-reading the numbers, this Dometic fridge should be able to restore the polar ice caps.

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[Jamesh]

Were you using a Genny to charge batteries to power a fridge via inverter?

Plug the fridge into the Genny!!!

 

[funflair]

Unless I'm mis-reading the numbers, this Dometic fridge should be able to restore the polar ice caps.

You are confusing amps with amps 15.4 is off the 12v batteries so most likely 180watt element.

 

[Bessy765]

No I was running the Genny to see how different load can be shared

 

[bigtwin]

No I was running the Genny to see how different load can be shared

Still don’t understand what you’re getting at.

Are you trying to understand the maximum output from your genny?

If so, a 1kW genny will give you 1000W/250V = 4A

Similarly, a 2.2kW genny will give you 9A

Am I close?

Ian

 

[funflair]

I think he/she was just messing about with the load sharing/network compensation, I call it “playing nicely “

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[jongood]

Who even makes a 1kw genny and why would you buy it

 

[bigtwin]

I call it “playing nicely “

I call it showing off.

Ian

 

[funflair]

Who even makes a 1kw genny and why would you buy it

Honda

 

[Raul]

Sorry if this is a long post but not the best at explaining. Having recently had a lithium upgrade, as previousl posted we have 700 watts of solar a Victron 2000/80 multi and 2 x 100 amp transporter Lithium batteries.
as we are still waiting for good old DVLA i thought I would have a little play and found the following
the Genny is a Honda EU10i running on lpg.
using the inverter only running the Dometic Fresh jet 2200 set to max cooling draws 103.3 amps with the Genny set at 4 amps @ 240 the battery consumption falls to 55 amps. Setting the Fresh jet to max heating uses 83 amps dropping to 33 amps with Genny set at 4 amps
Truma heating set at 1kw draws 83.1 amps again dropping by app 50 amps when Genny flat out, 2 kw draws 195 amps again dropping by app 50 amps with Genny set at 4 amps.
Dometic fridge on mains supplied by inverter only takes 15.4 amps,

Genny only charging the batteries through the multi, set mains input at 2 amps Genny stays on its idle setting producing 30.3 amps to the batteries, up the incoming from the Genny to 2.5 amps produces 36 amps Genny just a fraction above idle, up to 3 amps Genny increases but not flat out produces 43.3 amps, upto 3.5 amp from Genny produces 48.7 amps, Genny flat out 57 amps charging.

this again is not about the pros and cons of using a Genny but simply to give anyone who is interested some idea of what uses what and what produces what

While you had the AIr con on inverter running, and drawing 103adc @12,8v, despite you set the multi to 4A ac it did not draw all that 4a from Genny. The reason is power factor of compressor motor. The multi monitors the voltage and frequency of incoming ac, and if distorts it backs off as it has available power from batteries, hence still inverting 55adc. At this point, you should look at the ac power in and notice W in from shore or Genny. That would give you a true idea of how much Genny contribution comes in.

 

[ChrisL]

Is this a victron inverter charger?

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[Minxy]

You know sometimes how you wish you hadn't read a thread? My head hurts now!

 

[Bessy765]

I call it showing off.

Ian

That’s the sort of ignorant comment that could discourage people from posting who were genuinely try to give some information that may of be of some use to others. I had already stated that I was not the best at explaining.
the object was to show how some of the equipment in a motorhome can be used with either an inverter or Genny or a combination of both. Any reference to the amps the Genny was set to were at 240 ac.

Is this a victron inverter charger?

yes. A Victron 2000/80 multi inverter charger with power sharing

 

[The Wino]

I'm just wondering what the total spent is in order to have Aircon off grid and how many nights of site fees with hook-up would it pay for.

 

[funflair]

I'm just wondering what the total spent is in order to have Aircon off grid and how many nights of site fees with hook-up would it pay for.

Cost us about £12k to have enough power to run air con and everything else off grid

 

[funflair]

That’s the sort of ignorant comment that could discourage people from posting who were genuinely try to give some information that may of be of some use to others. I had already stated that I was not the best at explaining.
the object was to show how some of the equipment in a motorhome can be used with either an inverter or Genny or a combination of both. Any reference to the amps the Genny was set to were at 240 ac.

yes. A Victron 2000/80 multi inverter charger with power sharing

Don’t be put off, I think he was actually joking.

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[Minxy]

That’s the sort of ignorant comment that could discourage people from posting who were genuinely try to give some information that may of be of some use to others. I had already stated that I was not the best at explaining.

I am sure you have mistaken the comment, it wasn't meant as a criticism but as a joke ... hence he put the silly smileys afterwards. Also saying someone's comment is ignorant is not allowed under Rule 1. To be perfectly honest though I think your actual response would be more likely to put people off than the joke one I'm afraid.

Just don't take stuff too seriously, there are some techy bods on here who will love your thread and findings and appreciate the time you've taken to post the info.

 

[Tombola]

you original post will help some folk dont worry.

 

[ChrisL]

I think this post is incredibly helpful to anyone considering an inverter charger so big thanks to the OP.

 

[Bessy765]

103.3amps from a 1kw Honda generator.....???
Do you mean the Aircon was drawing 103amps from the batteries via an inverter and the generator was pushing 4 amps back into the batteries.

As I said not best at explaining, the Genny was set at 4 amps @ 240 ac by the load share facility of my Victron so the load on the batteries was reduced by app 50 amps. This was just a play around to find out what variations would accomplish

 

[funflair]

Sorry if this is a long post but not the best at explaining. Having recently had a lithium upgrade, as previousl posted we have 700 watts of solar a Victron 2000/80 multi and 2 x 100 amp transporter Lithium batteries.
as we are still waiting for good old DVLA i thought I would have a little play and found the following
the Genny is a Honda EU10i running on lpg.
using the inverter only running the Dometic Fresh jet 2200 set to max cooling draws 103.3 amps with the Genny set at 4 amps @ 240 the battery consumption falls to 55 amps. Setting the Fresh jet to max heating uses 83 amps dropping to 33 amps with Genny set at 4 amps
Truma heating set at 1kw draws 83.1 amps again dropping by app 50 amps when Genny flat out, 2 kw draws 195 amps again dropping by app 50 amps with Genny set at 4 amps.
Dometic fridge on mains supplied by inverter only takes 15.4 amps,

Genny only charging the batteries through the multi, set mains input at 2 amps Genny stays on its idle setting producing 30.3 amps to the batteries, up the incoming from the Genny to 2.5 amps produces 36 amps Genny just a fraction above idle, up to 3 amps Genny increases but not flat out produces 43.3 amps, upto 3.5 amp from Genny produces 48.7 amps, Genny flat out 57 amps charging.

this again is not about the pros and cons of using a Genny but simply to give anyone who is interested some idea of what uses what and what produces what

Hi Bessy765, you say you have 700watts of solar which is great but only 200ah of LiFePO4 I think you will find in the sunny times that you have more solar than you know what to do with, a bit more LiFePO4 would allow full electric operation from your inverter for a few days without sun and then a good day and all fully charged again, or do you plan to carry the generator with you? we only have 520watts of solar but have 460ah of LiFePO4

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