Pals and compatriots â€“
I received two units of this series yesterday; the 24 and 48V versions. Tonight I had the opportunity to hook these devices up and review them.
I wish to chronicle the timeline here rather than in the review mainly because I had already provided a similar timeline for the SP/S assembly. Some information may be repeated here from the review. Disclaimer:
These HRP-600 units when combined in series still create a 63-84V charging assembly
, therefore qualify as worthy of discussion under this here thread <nods>.
- HRP-600 24 + 48 = 63.3V PSU. No Load = 0.20A @ 121.1 VAC
- HRP-600-48: Tested Range = 39.1 to 58.2 VDC. Set to 39.1.
- HRP-600-24: Tested Range = 20.6 to 30.49 VDC. Set to 24.2.
- After assembly into series, fine tuning was required to reach 63.3 V. No Load now = 0.18A @ 120.8 VAC
Amp meter connected to VAC.Charging:At 9:00 PM sharp
, 15S6P LiPo pack was at 58.0V. No mods were made to the HRP units; they were assembled and put to use right out of the box (sans voltage adjustments). The charger was put on the pack, the voltage jumped to 58.8V (monitoring per CA), assembly current goes to 8.1A @ 118.8 VAC. Fans take off loudly relative to the SP/S assembly. For the first brief minute there was some strange whining, and possibly buzzing, but it went away. The first Â½ hour was loud â€“ however the pack was most definitely charging! I moved the amp meter around a bit and received a better reading; it was actually pulling 8.7A. The charging cable was 14 AWG that I had lying around; I thought it would make for a good experiment to see how it handled the current: It became very warm but not hot. Note to self: Use 10 AWG for in the field.
After about Â½ hour as the pack voltage reached 62.8 VDC (with the charge still on) the assembly was pulling 9 Amps; I noted this figure was slowly climbing as charging progressed, though I do not know why. Back-calculating, the assembly is using about 1 kW of power which is about double the SP/S assembly. The power usage is better than I had hoped, and not at double the maximum limit for both units. The 48V unit was definitely warmer than the 24V unit in one spot where the heat sink must have been, although it was by no means hot. Except for the fan noise, the process is going smoothly.At 9:35 PM
there is a marked change as the pack hits 62.9V! The fans begin to quaver and downwind off the full speed, although it is still quite loud. The current begins to drop off at a linear rate below 9A, then 8Aâ€¦At 9:42 PM
the fans make a dramatic change in speed and drop to about 30%; itâ€™s well above a whisper though welcomed nonetheless. The assembly current is now dropping below 5A.At 9:51 PM the fans stop
! The CA says the battery pack is at 63.4V, with the assembly current down to 2.75A. I elect to disconnect the charger; doing so the pack voltage drops to 63.1V and the assembly current goes to a no load state â€“ drawing 0.19A. I decide to reconnect the charger and wait out to see what happens if we leave it alone. The pack is essentially charged at this point, less than one hour which is truly quite impressive.About 10:25 PM
I check the pack and the CA says itâ€™s 63.5V. The assembly current is now pulling less than 0.5A and still dropping. Pulled the plug to check the real pack voltage â€“ and itâ€™s 63.5V! Shite Iâ€™ve never taken my pack this high before, however a quick calculation says the cell average is about 4.233 V so I shall not worry; we are done
I wish to conclude that this HRP series is most excellent for charging LiPos. The caveat, as I stated in the review is that we need to monitor when the assembly goes into trickle mode so we can pull the plug. By this estimate, I expect my charging times will be reduced by at least 50%. I am most pleased.
Maybe next year Iâ€™ll upgrade to the HRP-1000. Whatcha think?
Huntinâ€™ fer a Pepsi machine, KF