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Summer in Europe - thank youSummer or Winter? UK or abroad?
Sorry - it's just that I know how many watts each appliance consumes, so thought I could more easily see how long the batteries might lastYou're confusing your units I think. KW are a measure of power, like horsepower is in the imperial system.
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My Brain Hurts.........I'm thinking...
A question for the techies please
At 220v output (via a inverter) how many KW are there in 4 x 80ah gel batteries?
Robert
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Ignore what I wrote initially, I've had another look at it, see above - #5.Sorry - it's just that I know how many watts each appliance consumes, so thought I could more easily see how long the batteries might last
But it is a useful example of what folk can expect from an inverter if they want to run high wattage appliances - for which the answer is not for very long!Thank you guys - that makes sense
I expected the batteries to last longer than they are doing, but I guess we're using too much juice
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You have G80 Gel batteries which you can safely discharge to 80% DOD giving you 256 A/H of useable power. Allowing for the inverter being about 85% efficient it would give you 2.6 kw.
Too many variables on the solar, on a good day in southern Europe you could get as much as 1 kw back into the batteries, however a small amount of cloud could reduce that figure drastically.
Certainly on their website I could find no claim from Exide that 80% was a safe discharge level, even if they did I am pretyy sure regular discharging to that level would dramatically reduce the number of cycles the battery could achieve from the 1000 they seem to claim. I would stick to the 50% cut off and if more capacity is needed look at fitting more battery
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Robert, just go out and have another meal.Thank you guys - that makes sense
I expected the batteries to last longer than they are doing, but I guess we're using too much juice
Thanks for that LennyFrom Exide leaflet on Gel batteries
View attachment 89530
More Exide info here you can see a Gel battery gives 500 cycles @ 80% DOD compared to a Wet Cell giving only 50 cycles & 250 @50% DOD.
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But equally that shows that restricting discharge to 50% will give double that life, your regular discharge to 80% is not free. Another thought is that the voltage of the battery under load when discharged below 50% may activate the low voltage trip on the invertor
I was pointing out that taking a Gel to 80% DOD is still going to give a life cycle of many years, in practice you are hopefully not going to discharge to 80% every time particularly when you have 200 watts of solar to keep the battery topped up.But if you get 1000 cycles at 40% discharge and 500 cycles at 80% discharge what is the difference as essentially you had the same power, agree about the low voltage trip on the inverter.
Martin