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14S Battery input to which grid-tied inverter?
#1
Hi,

I think my setup/requirement is a little special. I've been browsing the forum for a while but I 'm still looking for some advice.

I have 3x 14S10P batteries Li-Ion that I built for my E-Bikes.
During daytime I charge them with the chargers I have bought for this purpose. These chargers just take plain 220Vac in, and give 58 Vdc out at 5A to charge my batts.

During the night I want to discharge it all back into the grid/house, so therefore I need a grid-tied inverter that takes the 14S batteries as input.
So during the night, what I don't use in my house will go into the grid, which is beneficial in my specific case with dual tarif energy counters.

So today I did a test as follows. I have a cheap Aliexpress 300W grid-tie inverter which is intended to get DC in from Solar panels. In stead I hooked my 14S to the DC input
and yes it worked Smile . Battery was at 52Vdc and the inverter sucked around 10A out of it to output some 360 Watts into the house/grid....
So the efficiency was quite bad imo. ... only some 70%, probably because the input voltage was probably exceeding the MPPT -range... ? 
This inverter is specified to take up to 60Vdc in, but at such efficiency, I'm looking for something better.
Also when my battery is fully charged it is at 58Vdc so I guess then the efficiency will be even worse.

So basically, I'm looking for an inverter that is grid-tied with good efficiency that takes 14S Li-Ion as DC source. Power ? +- 600W will do.
So far, I can only see efficient grid-tie inverters that are intended to take typical Solar Panel inputs, and hybrids seem overkill ?
Thanks for any suggestion.
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#2
I think I found a suitable solution : SUN-1000G2-LCD

Is designed to operate from both solar and battery input, in battery mode you can even set the cut-off voltage to protect your battery.
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#3
(09-04-2019, 09:48 PM)DirkB19 Wrote: Hi,

I think my setup/requirement is a little special. I've been browsing the forum for a while but I 'm still looking for some advice.

I have 3x 14S10P batteries Li-Ion that I built for my E-Bikes.
During daytime I charge them with the chargers I have bought for this purpose. These chargers just take plain 220Vac in, and give 58 Vdc out at 5A to charge my batts.

During the night I want to discharge it all back into the grid/house, so therefore I need a grid-tied inverter that takes the 14S batteries as input.
So during the night, what I don't use in my house will go into the grid, which is beneficial in my specific case with dual tarif energy counters.

So today I did a test as follows. I have a cheap Aliexpress 300W grid-tie inverter which is intended to get DC in from Solar panels. In stead I hooked my 14S to the DC input
and yes it worked Smile . Battery was at 52Vdc and the inverter sucked around 10A out of it to output some 360 Watts into the house/grid....
So the efficiency was quite bad imo. ... only some 70%, probably because the input voltage was probably exceeding the MPPT -range... ? 
This inverter is specified to take up to 60Vdc in, but at such efficiency, I'm looking for something better.
Also when my battery is fully charged it is at 58Vdc so I guess then the efficiency will be even worse.

So basically, I'm looking for an inverter that is grid-tied with good efficiency that takes 14S Li-Ion as DC source. Power ? +- 600W will do.
So far, I can only see efficient grid-tie inverters that are intended to take typical Solar Panel inputs, and hybrids seem overkill ?
Thanks for any suggestion.


Hi Dirk, 

You have a link for that cheap 300W inverter?

Tnx
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