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Old 12-06-2022, 09:28 AM   #1
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100A (or more) charger compatible with a Magnum 2812 for LiFEPo4

I have a magnum 2812 which produces about 109A to charge the LiFePo4s.
If I could add another charger in the 100 to 120A range I could cut generator run times in half and balance the load on both phases of the genset.

Magnum doesn't seem to sell one.

I haven't found anything with a remote that would let me fix any issues with imbalances.

Has anybody successfully integrated a high power charger with a magnum 2812 such that you get nearly full performance out of both of them?
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Old 12-06-2022, 10:33 AM   #2
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If I could add another charger in the 100 to 120A range I could cut generator run times in half and balance the load on both phases of the genset.
How big is your generator ? A 2812 probably requires a 3000W 120V generator. Do you have a 6000W 240V generator ?
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Old 12-06-2022, 11:58 AM   #3
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8000 Watt diesel. That is two 36A 120V legs.

8000 watt diesel genset, with two 36A 120V legs.

I have more than enough genset power to run two 120A chargers.
That would be another advantage of having a second charger on the other leg.
The inverter circuit has the kitchen on it so if I am microwaving and running the induction cook top at full power the power management system rolls back the charging current.
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Old 12-06-2022, 02:28 PM   #4
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Any charger can be connected in parallel for faster charging.

When I upgraded to lithium I kept my old converter for the same purpose you outlined.
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Old 12-06-2022, 02:52 PM   #5
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Pick up another inverter/charger and just use the charging section.

You can also check IOTA, they make 90 amp converter/chargers and parallel kits to pair up 2, 55 amp converter/chargers.
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Old 12-06-2022, 03:22 PM   #6
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....
If I could add another charger in the 100 to 120A range I could cut generator run times in half and balance the load on both phases of the genset.
....
What is your run time?

What I do to reduce my run time and increase load on my too big Onan generator is run the genny when I am use large loads such as the microwave.

If you reduce the amount of amps you take out of battery you reduce the amount you have to put back in.
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Old 12-06-2022, 03:34 PM   #7
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If you reduce the amount of amps you take out of battery you reduce the amount you have to put back in.
Sure but then you may as well sell half the batteries.

The idea is to limit both generator run time and run sessions.
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Old 12-06-2022, 09:23 PM   #8
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Can't you parallel that model of inverter?
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Old 12-07-2022, 06:37 AM   #9
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Run times can be 3 or 4 hours on bad days

The inverter will put in about 109A max. 400AH a day isn't unusual so almost 4 hours. 2 hours would be nicer. I suspect the genset will be as if not slightly more efficient at the 50% load that would represent.

I use all the power I want on battery that's why I have them.

Out west my solar normally covers 100%. Out east it seems like we are always under some trees or some clouds or both and the solar only buys me a few days or like now virtually nothing.

I could cut runtimes down by using propane for cooking but I don't want to.

I do run loads when running the generator like the kitchen as I mentioned, or the drier. If it is hot I might treat myself to some A/C. Typically I don't heat water with the genset.

Magnum 2812 can not be operated in parallel nor can they be stacked (one feeding the other)

I could put a 2812 in on the other leg and power things that are not normally powered. Most of the driver side and exterior receptacles are not powered by the inverter. That would be a lot of wiring and probably a new subpanel not to mention thousands instead of hundreds of dollars for inverter/charger vs charger. I might even swap out my magnum 2812 for a magnum 3000 and use the old 2812 for charging but again, high cost with out much significant benefit.
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