lorettaboy
Member
I'm a brand spanking new member to these forums and am looking for some advice and feedback on my new solar system.
The wife and I are the proud new owners of a 30 foot Freedom Express TT, that has a solar port on the roof (10 ga. wiring).
We will be using our existing battery setup of 2 Trojan T105's, but may upgrade to lithium in the future.
Our power usage is fairly low, just 12V other than running a small 150 watt inverter to watch some TV from time to time.
The charge controller we've already purchased is the Victron 100/50, along with the BMV-712 battery monitor.
We have 6 100w solar panels (21.6V Voc, 17.3V Vmpp, 6.17A Isc, 5.78A Impp), but are contemplating adding 2 more.
We will be camping in some partially shaded campsites, so i am planning on installing 3 or 4 panels on each end of the roof connected in series and then in parallel.
By my calculations, the 3S2P array will produce 64.8V and 12.34A, while the 4S2P will produce 86.4V and 12.34A.
When I input my panels into the Victron calculator, it suggests using the 150/60 MPPT, which seems like overkill.
I've also plugged the same numbers into the Victron excel sheet, which shows that the 150/50 MPPT should do the trick.
Given these numbers, do you think we will be okay with the 150/50? And for the extra $200, is it wise to go with 8 panels vs 6?
The wife and I are the proud new owners of a 30 foot Freedom Express TT, that has a solar port on the roof (10 ga. wiring).
We will be using our existing battery setup of 2 Trojan T105's, but may upgrade to lithium in the future.
Our power usage is fairly low, just 12V other than running a small 150 watt inverter to watch some TV from time to time.
The charge controller we've already purchased is the Victron 100/50, along with the BMV-712 battery monitor.
We have 6 100w solar panels (21.6V Voc, 17.3V Vmpp, 6.17A Isc, 5.78A Impp), but are contemplating adding 2 more.
We will be camping in some partially shaded campsites, so i am planning on installing 3 or 4 panels on each end of the roof connected in series and then in parallel.
By my calculations, the 3S2P array will produce 64.8V and 12.34A, while the 4S2P will produce 86.4V and 12.34A.
When I input my panels into the Victron calculator, it suggests using the 150/60 MPPT, which seems like overkill.
I've also plugged the same numbers into the Victron excel sheet, which shows that the 150/50 MPPT should do the trick.
Given these numbers, do you think we will be okay with the 150/50? And for the extra $200, is it wise to go with 8 panels vs 6?