I have a question about generator run time to charge a battery bank

Re: I have a question about generator run time to charge a battery bank

Generally, the Honda eu3000 family has an 12 amp unregulated 12 volt output used to recharge small batteries/emergency car battery recharging, etc.

For many reasons, it is not really useful for recharging a large battery bank.

Regarding your battery bank:

set of Eight 140.AMP hour's battery to make up 12.volt power

Are those 6 volt or 12 volt batteries?

If 6 volt, that would be 4x140AH=560AH 12 volt battery bank.

If 12 volt, that would be 8x140AH=1,120AH at 12 volt battery bank.

In general, we recommend 5-13% for solar charging and you can go as high as 25% of battery bank capacity with an AC charger...

If you are using standard battery charger... They tend to be 80% efficient and may have power factor of ~0.6... For a 2,800 watt rated genset charge a 12 volt battery bank, the maximum charger rating would be around:

• 2,800 watts * 0.80 eff * 0.6 PF * 1/14.5 volts charging = 93 amps maximum

The minimum rate would be 5% of rated capacity:

• 1,120 AH * 5% = 56 Amps minimum recommended charging (if 8x12 volt batteries)

Normally, we would recommend that people cycle a battery bank to 75% to 50% of state of charge...

So depending on how large a battery bank, how deep the discharge, and size of battery charger, would affect how fast you could recharge. Also, there is 2-4 hours or so of taper charge (last 80-90% to 100% of charging cycle).

-Bill