Search found 4006 matches

by tallgirl
Fri Sep 28, 2007 5:43 pm
Forum: MX60 Charge Controller
Topic: MX60 maximum input limits
Replies: 34
Views: 21853

Tallgirl, Many of the folks here do believe the NEC is the bare minimum and often the butt of many jokes. They often are so far behind state of the art that the building departments get confused, which is SOP for most that I have dealt with. I've not seen any evidence that the NEC is a bad idea, an...
by tallgirl
Fri Sep 28, 2007 5:30 pm
Forum: Mate
Topic: how to calculate kwh needs ?
Replies: 13
Views: 7700

Hello again Rob, Sorry to disagree with an esteemed forum member on "not adding things up because of diversity." My fuel efficient car gets 100 MPG on a down hill coast, but when accelerate to ascend the other side, MPG drops to 20 or so. Diversity would say I get 60 MPG average, but in fact I get ...
by tallgirl
Wed Sep 26, 2007 7:59 pm
Forum: Backup Applications
Topic: SellRE settings for a backup system
Replies: 2
Views: 2937

SellRE settings for a backup system

Greets. The system I have (see my sig) was designed primarily for backup situations, plus to make a bit of electricity on the side ;) I'm curious about different values for SellRE. I'm wondering, in particular, if setting it higher than the current value of 52.4V would give me more backup power shou...
by tallgirl
Wed Sep 26, 2007 6:16 pm
Forum: MX60 Charge Controller
Topic: MX60 maximum input limits
Replies: 34
Views: 21853

I still haven't figured out what this means in terms of NEC "approved" output current from an MPPT controller with DC-DC stepdown capability. But, if you use the full current output spec as a metric, then ~28.8 V x 60 A = 1,728 W. The NEC requires that conductors be derated by 80% (1 / 1.25 = 0.80)...
by tallgirl
Wed Sep 26, 2007 5:51 pm
Forum: Grid Tie Applications
Topic: Erratic grid voltage or not?
Replies: 10
Views: 3563

Erratic grid voltage or not?

Greets. My new system was just installed and I have some questions about what I'm seeing. The other morning, at 5:21AM the inverters saw the grid go to 131VAC, so they disconnected and started running the house on batteries. Which is okay. What I saw while they were disconnected was pretty disturbin...
by tallgirl
Wed Sep 26, 2007 5:35 pm
Forum: Mate
Topic: how to calculate kwh needs ?
Replies: 13
Views: 7700

First, you don't have to add up everything because of load diversity. That is, you aren't running everything all the time anyway. Second, the inverters have headroom that can be used to start an inductive load. For example, the GVFX 3648 is rated at 3,600 watts, but it will produce up to 5,000 watts...