My has-more-money-than-me pal wants to be able to charge a few batteries at one time. i was thinking of the 306b icharger, which i believe kloner has and likes. i wa thinking he should maybe get this combo (when everything gets back in stock): http://www.progressiverc.com/the-solution-1000w-combo.html .what say ya'll seem good? will he be able to use DC power as well -- he really wants that -- and how many batteries could he chargd on DC at one time? thanks!
icharger 306b and what else?
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PeterLester
Member
I am using the Quattro 4x6 Multicharger by HobbyKing. It has most features and will charge four batteries.
One feature that is missing: Battery internal resistance determination. I use a Hyperion charger for that or calculate manually.
It is powered by a Dell PowerEdge NPS700AB which I was able to get dirt cheap.
In anticipation of future needs, e.g., 4 larger batteries I ran a 2 pole 220VAC 40 amp circuit from my main distribution panel to a garage subpanel which splits back down to 120 VAC where I charge all batteries on the concrete floor. This arrangement can accomodate two PowerEdges if/when the need arises.
All done exactly to NEC/CEC code to remain safe and legal. Don't want to burn the house down.
One feature that is missing: Battery internal resistance determination. I use a Hyperion charger for that or calculate manually.
It is powered by a Dell PowerEdge NPS700AB which I was able to get dirt cheap.
In anticipation of future needs, e.g., 4 larger batteries I ran a 2 pole 220VAC 40 amp circuit from my main distribution panel to a garage subpanel which splits back down to 120 VAC where I charge all batteries on the concrete floor. This arrangement can accomodate two PowerEdges if/when the need arises.
All done exactly to NEC/CEC code to remain safe and legal. Don't want to burn the house down.
ProgressiveRC - "The Surface" 500W Combo - Charger Combos - Chargers
This is the one the guy at P-RC recommended for my friend. Only difference is the power supply, 500 vs 1000. What do you get for 500W more?
He also rattled off a formula that'd tell me how long it would take to charge, say, three 3s 4000mah at one time. I didn't quite get the formula. Anyone here know what it is?
This is the one the guy at P-RC recommended for my friend. Only difference is the power supply, 500 vs 1000. What do you get for 500W more?
He also rattled off a formula that'd tell me how long it would take to charge, say, three 3s 4000mah at one time. I didn't quite get the formula. Anyone here know what it is?
EastCoastJib
Member
I'd love that formula as well.
ProPilotWannaBe
Member
A 3s battery at near full charge is 12.6V; charging at 1C for a 4000mah battery is 4A, that means charging one battery requires 50.4watts to charge a 3s 4000mah at 1C. If you want to charge, say a nano-tech, at 5C, then you'd need a 250 watts supply for just one battery. Then doing 2 batteries would be 500 watts.
Keep two other things in mind:1) there is power loss through the supply, and the charger, so you'd want more than 500 for that case. 2) that is the current needed to maintain the 5C charge even when near fully charged.
Here's a good article I found on the subject.
http://www.rchelicopterfun.com/rc-battery-chargers.html
Keep two other things in mind:1) there is power loss through the supply, and the charger, so you'd want more than 500 for that case. 2) that is the current needed to maintain the 5C charge even when near fully charged.
Here's a good article I found on the subject.
http://www.rchelicopterfun.com/rc-battery-chargers.html