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Is the baterry dead?

Hello, i get 2x 12V 95Ah AGM battery, is new (never used) but the voltage when i get them was only 8,3V. I think was long time in stock 🤷‍♂️Now i charging them from my small solar systém. I let them few days, on solar charger was 13,6V and signalizated fully charge but when i disconect solar panel was droped to 12,5V, i use also inverter 12v to 220v 1000W, from this "fully charged" battery i get only 0,3kWh (on the inverter output) My first question is, is the baterry dead? Is some way to rescue them? Second question is, when i calculated capacity of this battery, is 1150Wh, is really possible get the whole power from it or better not deep discharging? When Teoreticly have this capacity, how many kwh i can get from one battery with using this invertor? Like 80% or less? Thanks

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Hi @vojtech59738

If deep discharging AGM batteries, they need to be recharged at 14.5V - 15.0V.

13.6V -13.8V is only suitable when they're in standby mode to keep them fully charged i.e. floating charge.

Here's a link that explains it better than I can.

Theoretically 95AH capacity = 95A for 1 hour or 1A for 95 hours so it can be anywhere in between. This is only in theory of course, it doesn't happen in practice.

The power output length of time from the battery, depends on the amount of current that it has to supply to the connected load.

What are the power requirements of the load connected to the inverter? There can also be a 5%-15% power loss in the inverter, depending on the efficiency of the inverter being used that has to be taken into account as well.

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