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Sunny Buddy - MPPT Solar Charger (Open hardware) copy

6 months ago 48
  • Description
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  • BOM
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Description

Description: This is the Sunny Buddy, a maximum power point tracking (MPPT) solar charger for single-cell LiPo batteries. This MPPT solar charger provide you with the ability to get the most possible power out of your solar panel or other photovoltaic device and into a rechargable LiPo battery. Set-up is easy as well, just plug your solar panel into one side of the Sunny Buddy and your battery into the other and you are good to start charging!

The output of the Sunny Buddy is intended to charge a single polymer lithium ion cell. The load should be connected in parallel with the battery. By default, the Sunny Buddy comes set to a maximum charge current of 450mA with a maximum recommended input of 20V (minimum 6V). It’s recommended that batteries not be charged at greater than their capacity rating; thus, the smallest battery that should be charged with the Sunny Buddy is 450mAh.

Each Sunny Buddy comes equipped with a LT3652 power tracking 2A battery charging circuit and pre-installed barrel jack and 2-pin JST connectors with unpopulated areas to install your own personal 3.5mm screw terminals for added input/output options. This revision also adds a potentiometer to the input to set the holding voltage for MPPT and we’ve also tweeked the feedback resistors on the output to change the float voltage.

GitHub (Design Files) Sparkfun link:https://www.sparkfun.com/products/12885

Documents

SunnyBuddy-v13 SCH copy

SunnyBuddy-v13 PCB copy

BOM

ID Name Designator Footprint Quantity
1 FRAME-LETTER FRAME1 CREATIVE_COMMONS 1
2 LT3652 U1 MSOP-12_GND 1
3 0.22 R1 0805 1
4 10uF C1 1210 1
5 47uF C3,C4 EIA3528 2
6 10uF C2 1206 1
7 68uH L1 CR75 1
8 ZLLS500 D1,D2 SOT23 2
9 1.0uF C5,C6 0603-CAP 2
10 JST_2MM_MALE J3 JST-2-SMD 1
11 220k R3,R6 0603-RES 2
12 47k R2 0603-RES 1
13 M02 J5 1X02 1
14 M02 J6,J7,J8 SCREWTERMINAL-3.5MM-2 3
15 5.5x2.1mm Barrel J1 POWER_JACK_SMD 1
16 POWER_JACK J2 POWER_JACK_PTH 1
17 JUMPER-2 JP1 SJ_2S 1
18 JUMPER-2 JP2 SJ_2S-NO 1
19 SFE_LOGO_NAME_FLAME LOGO1 SFE_LOGO_NAME_FLAME_.2 1
20 OSHW-LOGO LOGO2 OSHW-LOGO-M 1
21 STAND-OFF STANDOFF1,STANDOFF2,STANDOFF3,STANDOFF4 STAND-OFF 4
22 10K R4,R5 0603-RES 2
23 M04 J4 1X04 1
24 10k R7 TRIMPOT-3MM 1
25 R_SEN JP4 1X02 1
26 JUMPER-PTH-2-NC JP3 PTH-JUMPER-NC_BOTTOM_NO_SILK 1
27 OSHW-LOGO LOGO3 OSHW-LOGO-S 1
28 SFE_LOGO_NAME_FLAME LOGO4 SFE_LOGO_NAME_FLAME_.3 1
29 FIDUCIAL FID1,FID2 FIDUCIAL-1X2 2

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