Tracer 4215BN 36-48v?

[rearden]

I have a Tracer 4215BN which I am using to charge my 24v SLA test batteries and running an enphase M215 with a NTC thermistor after dark.

I think the Enphase would be more efficient if it saw higher voltages, something closer to what a 60 cell panel usually produces. I noticed on the Solar Monitor software > Parameters > Control Parameter > Rated Voltage Level, that there are options for 12, 24, 36, 48 and Self Recognition. I assume they use this software for all their models, so the additional voltages are probably for those units, but...
Has anyone tried the 4215BN at anything other than 12 or 24V? I would like to try 36 or 48 but would also like to keep the smoke in my unit.
If not, do you have any suggested methods of testingthat would not damage my unit if it can't?

rearden

 

[friedpenguin]

As my intentions are for off grid and mostly DC I keep mine at 24v. I've decided I'll most likely get the 24v Victron inverter for when I need to run a 110v load. What's a "NTC" ? With no knowledge of what that is I don't understand the need for the micro inverter so enlighten me please.

 

[rearden]

As my intentions are for off grid and mostly DC I keep mine at 24v. I've decided I'll most likely get the 24v Victron inverter for when I need to run a 110v load. What's a "NTC" ? With no knowledge of what that is I don't understand the need for the micro inverter so enlighten me please.

Negative Temperature Coefficient Thermistor or a current inrush limiter. It's resistance drops with increasing temperature. The micro inverter is expecting a solar panel which has quite a different current availability profile than a battery. The NTC thermistor reduces some of the current inrush when it turns on.

 

[friedpenguin]

The manual for the 4215BN only mentions 12/24v so I'd play it safe and keep the magic smoke in your unit. I still don't understand the need for the NTC thermistor but it's outside the scope of the thread. I've haven't run into an issue yet with my Tracer and running loads off my batteries and don't see where a micro inverter would do me any good but we all have different needs.