Bosch 500 Powerpack - Inverter Rating?

[Kannon Fodda]

I can't get my head round the various calculations.

Bosh Powerpack 500 - specs say 36V 13.4 Ah 500W
Bosch standard charger - 230V 4A input - 4.5hour complete charge

So what capacity inverter is needed from the 12V MH leisure battery? I assume a pure sine wave unit is needed. I also assume you need a bit of headroom to allow for inefficiency of the inverter process.

And is the equivalent current being drawn from the 12V battery over that period of time likely to be a problem? Can the 12V battery sustain that.

I'm assuming that 13.4Ah is sort of equivalent despite different battery voltages, 12V and 36V, so that even a smaller leisure battery will (if it started fully charged) have capacity.

Thanks

 

[Richard n Ann]

Minimum 960w inverter ?

 

[Kannon Fodda]

Thanks, I'm assuming 960w has no headroom for inverter inefficiencies.

If I'm using the calculators correct, 960W x 12V means a current of 80A That would need some beefy wiring, and surely would kill most MH batteries?

 

[Richard n Ann]

Yes, must be a very fast charger, but you can with lithium though ?

 

[Kannon Fodda]

Bosch do 3 types of 230V charger all compatible with their different size batteries, 2A compact, 4A standard and 6A fast. The 2A would also work down to 110V but apparently takes up to 7.5hours for the 500W battery charge.

I suspect the 2A compact charger would need a smaller inverter, and perhaps be friendlier to the MH leisure battery. Even so could the MH battery deal with a heavy load over 7+ hours?

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[Richard n Ann]

Somethings not right, it can't be 4a input. That equates to over 100ah. 4a must be the charge rate ?

 

[Richard n Ann]

Look for a label on the charger that gives wattage or current on the 240v input side.

 

[Kannon Fodda]

Yep I think something is missing from the Bosch website.

From the back of the compact charger:
Input 100-240V ~ 50/60Hz 1.6A
Output 36V 2A

So yes their figures are the charging output rate, which no doubt makes the inverter, cable and battery demands a lot nicer.

 

[Richard n Ann]

Minumun 384w inverter for the 2a charger then.
Just get a good quality 1000w psw inverter. Or if you want a really good one look at the 1000w Studer AJ series ??

 

[Augusta08]

Charge both of mine with a 300w sinewave inverter, the 4amps is output so 36v x 4a = 144watts each.

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