1000 watt Yamaha generator?

pnichols wrote:

MEXICOWANDERER wrote:
Will your Parallax stay in float mode while supplying 30 amps of float? Every 30-days it would be appropriate to zap flooded batteries with 15 minutes of 15.0.

My 7345 has one "mode" - from it's fixed voltage output circuit that can supposedly supply up to 45 amps if it's output circuit's resistance in parallel with the battery's intrinsic resistance allow the 7345's output voltage to stay in a range around 13.8 volts.
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( don't have the coloured ink needed for this way of replying, so do what you can-- :( )

Using the 7355 I have as a power supply is different from using it as a battery charger for amps out. As a battery charger its amps out is limited by the high R of the battery and the wiring.

Using the 7355 to support the battery bank that is running an inverter running something that draws over 55 amps, and with low R wiring to battery, I got 56 amps out no problem. So the 7300s can do their rated amps, but in "power supply mode".

Same wiring to battery and low battery, I could only get about 35 amps instead of 56. Some of that is from being at 13.8 instead of 14.8 at the converter.
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When a battery's internal resistance at whatever SOC it's at - in parallel with the 7345's output resistance - is so low that at that SOC the 7345 can't delivery enough current to force it's output voltage up to around 13.8 volts, then my 7345 sits there at way less than 13.8 volts output delivering to my batteries way less than 45 amps because at way less than 13.8 volts on their terminals the batteries won't accept anywhere near 45 amps anyway.

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That makes no sense to me at all! :) ????

There is a "loaded voltage" for the 7300s to ISTR about 13.4v but it does its amps if the battery will accept them at 13.8
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It would take a considerable larger amperage capacity power supply than a 7345 to maintain 13.8 volts or higher on it's output terminals when starting out to charge my 230 AH AGM RV battery bank at 50% SOC.
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Don't get that either. You can't start out with the battery at the same voltage as the charger or nothing would happen. Doesn't matter how big the battery bank is. The voltage you see on the wires between converter and battery bank is somewhere between the two voltages when not connected. It will rise as the battery voltage rises to the converter's voltage at the end of the recharge.
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...skipped some....

Actually, the method of manually adjusting the output voltage of a high current capacity charger so as to force all of the current into the batteries that they will accept at that voltage throughout the charging process is probably the ultimate way to charge lead acid batteries. However, it can take money, time, and a battery-nerd mentality to charge this way.

But the battery always accepts as many amps as it can at any particular SOC at any particular voltage. In Bulk, the amps will be flat-lined by the current limit of the charger or else the amps could be higher. As SOC rises, at some point the charger's amps limit equals the acceptance rate for the battery voltage and now amps taper. That is the start of the Absorption Stage.

What Mex wants is to have his Bulk stage end at the moment he starts the recharge so it is all Absorption stage. That means using such a high amp limit charger at the 14.8v desired, that battery voltage spikes so high that at the low SOC you have at the start, the acceptance rate is already limiting the high amps the charger can do. Amps then taper from the start all the way down to the end. He calls that "saturation" charging, where it is all Absorption Stage.

The voltage adjustment feature only means you can pick the desired voltage such as 14.8 at the start, instead of 13.8 or 14.4 or whatever. You don't adjust that during the recharge. You adjust that down to the Float voltage desired after the recharge.